Mold for hollow articles.



PATENTED JAN. .14

.KERR 6L J. SMITH.

MOLD FOR HOLLOW ARTICLES No.'876,7l9.

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L. KLRR & I. SMITH. MOLD POR HOLLOW ARTICLES.

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MOLD FOR HoLLo RTIULES.

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No. 876,719. PTENTED JAN. 14, 1908.

' E. KBRR & J. SMITH.

MOLD .FOR HOLLOW ARTICLES.

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EDWARD KERR AND `IAMES SMITH, OF PITTSBURG, PENNSYLVANIA.

MOLD FOR HOLLOW ARTICLES.

Specification of Letters Patent.

Patented Jan. 14, 1908.

Application filed May 2| 1907. Serial No. 371,460.

To all 'whom t may concern.'

Be it known that we, EDWARD KERK and JAMES SMITH, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, citizens of the United States, have invented or discovered certain new and useful Improvements in Molds for Hollow Articles, of which improvements the following is a specification.

The invention described herein relates to certain improvements in casting hollow annular bodies, such as nozzles for twyers, where provision must be made for ventilating the core, which in the completed casting is entirely surrounded by metal, except where the core ventilating pipe projects.

The invention has for its object the supporting of the core by the Ventilating pipes and the provision of suitable means whereby the core may be accurately and quickly placed and anchored in position in the matrix of the mold.

The invention is hereinafter more fully described and claimed.

In the accompanyingl drawings, forming a part of this specification, Figure 1 is a sectional elevation of an improved mold for twyer nozzles having my improvement applied thereto; Fig. 2 is a sectional elevation of a complete twyer nozzle; Fig. 3 is an end view of the same; Fig. 4 is a sectional elevation of a core box showing the core ventilating pipes and anchors in position therein; Fig. 5 is a side elevation of the complete core with the anchors; Fig. 6 is an end view of the core; Fig. 7 is a perspective View of a form of anchor for use in the manufacture of large twyer nozzles; Figs. S and 9 are sectional elevations showing steps in the formation of the mold, the complete mold being shown in Fig. 1,' Fig. 10 is an end view and Fig. 1.1 a sectional View of the pattern for the twyer nozzle; and Fig. 12 is a sectional view of a modification of a pattern for large twyer boxes.

In the practice of my invention the pattern 1, as shown in Fig. 9, is provided on one end with a circular recess for the reception of a ring 2 with which the prints 3 are connected (preferably being formed integral therewith) said prints being adapted to form matrices in the drag 4 of the mold for the reception of shoes or anchors on the core as hereinafter described. In forming the mold as shown in Fig. 8, the pattern 1 is placed with its large end downward on a follow board 5,

the ring 2 with the prints 3 having been removed from the pattern. The intermediate mold 6 is placed on the board around the pattern 1 and the sand packed therein. The intermediate mold being shorter than the pattern as shown. The cope 7 is then placed on the' intermediate mold and the sand packed therein around the upper end of the pattern, which, as stated, projects into the cope. Suitable gates or sprues (not shown) are formed in this cope for the admission of the metal. The cope and intermediate mold are then inverted onto another board 8 and the ring 2 with the anchor prints 3 is placed in position on the upper end of the pattern. The drag 4L is then placed in position upon the intermediate mold and the sand packed therein.

Vhile forming the intermediate and cope portions, a green sand core is formed within the pattern but this should not be packed tightly so that gases may escape therethrough. When forming the drag portion of the mold, parting sand is not placed upon the exposed end of the green sa'nd core, so that it may become integral with the sand packed in the drag. After the formation of the drag the whole mold is again inverted and placed upon a suitable support as the stool 10, drag down. The cope is then removed, the intermediate mold lifted off the drag and from around the pattern. The pattern is then withdrawn and if the ring 2 with the prints 3 have not come away with the pattern, they are also removed. The mold is then ready for the reception of the core 11. This core is formed within a box 12 around a circular block 13, said parts, being supported upon a suitable board 14. In this board are formed recesses 15 for the reception of the shoes or anchors 1.6, which are secured to anchor rods, preferably made in the form of perforated vent pipes 17. The recesses 15 correspond in position relative to the core matrix to the position of the prints 3 relative to the mold ma-A trix. When the anchors or shoes are in position on the board 14 these pipes will project up into the annular space between the box 12 and the block 13. Between the box and the block 13 is interposed a distance-ring 18, the thickness of which would depend upon the desired thickness of metal in the end of the twyer nozzle. Before forming the core dry sand or other material which will not adhere to the core material, is placed in the bottom of the annular space, the thickness of such material corresponding to the thickness l prints 3 and the ring 2 carrying the same of the ring 18. Core material is now packed must be modified accordingly so as to form in the annular space and around the perforated pipes 17 which not only serve for the purpose of Ventilating the core but also to sti'ien the same, and connect it to the shoes or anchors 16.

After the moldv has been formed as described, a core which has been previously baked is placed in position upon the drag, the shoes or anchors 16 entering the matrices formed by the prints 8 in the drag, thereby insuring the proper positioning of the core 11 with relation to the green sand core and the outer surface of the matrix. The intermediate mold is then placed on the drag being slipped over the core 11. It will be seen by reference to Fig. 1 that portions of this intermediate mold will rest upon the shoes or anchors 16 and thereby hold them Vfirmly in place and operating through the perforating pipe will anchor the core 11 in proper position. The cope is now placed in position on the intermediate mold and the mold is ready for casting.

I/Vhen the cores are small and the shoes or anchors 16 of small weight, they can be made independent of each other as they will be securely held within the cores and there will be no liability of injuring the latter in handling. But when the core is large and there fore of considerable weight, it is preferred that these shoes or anchors should be secured to or 'formed integral with a supporting ring 20 as shown in Fig. 7. The shoes or anchors 16a projecting radially from the ring, the shoes and connecting ring would in such construction form an efficient support for the core, whereby it may be removed without injury. When this construction is used the suitable matrices in the complete mold.

It will be readily understood by those skilled in the art that by our improvement7 a mold can be much more accurately and quickly formed than in the old method heretofore used, in which it was customary to incorporate wires in the vent pipes which were afterwards passed down through holes in the drag and secured to the underside of the supporting board so as to hold the core down while the metal was being poured. In the old method the core was liable to be displaced by the different pull or tension to which the anchoring wires were subjected.

I/Ve claim herein as our invention:

1. A core for casting hollow articles having in combination therewith a series of anchor rods extending into the core, and anchors secured to the projecting ends of said pipes and projecting radially beyond the perimeter of the core.

2. A mold for casting hollow articles having in combination mold sections, a shaping matrix formed therein7 one of said sections having recesses outside of the matrix for the reception of the core anchors, a core having a series of anchor rods secured therein and shoes or anchors secured to said rods `and projecting radially beyond the perimeter of the core and adapted to seat in the recesses when the core is in position in the mold.

In testimony whereof, we have hereunto set our hands.

` EDWARD KERR.

JAMES SMITH. Witnesses:

CHARLES BARNETT, J. HERBERT BRADLEY. 

